package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    /**
     * 获取商品服务三级菜单
     * @return
     */
    @Override
    public List<CategoryEntity> getTreeList() {
        List<CategoryEntity> categoryEntities = baseMapper.selectList(null);

        //stream流操作list,获取商品服务菜单
        List<CategoryEntity> categoryEntityList = categoryEntities.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == 0;
        //商品服务数据关系映射
        }).map(menu->{
            menu.setChildren(getChildrenMenu(menu,categoryEntities));
            return menu;
        //商品服务数据排序
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return categoryEntityList;
    }


    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 删除之前检查是否有别的引用

        baseMapper.deleteBatchIds(asList);
    }

    private List<CategoryEntity> getChildrenMenu(CategoryEntity categoryEntity,List<CategoryEntity> categoryEntities){
        List<CategoryEntity> collect = categoryEntities.stream().filter(menu -> {
            return categoryEntity.getCatId().equals(menu.getParentCid());
        }).map((menu2)->{
            menu2.setChildren(getChildrenMenu(menu2,categoryEntities));
            return menu2;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return collect;
    }

}